<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        html {
            font-size: 14px;
        }

        div {
            height: 10rem;
            width: 10rem;
            background: blue;
        }

        span {
            display: block;
            height: 20rem;
            width: 20rem;
            background-color: rgb(122, 193, 193);
        }
    </style>
</head>

<body>
    <div>
    </div>
    <span>
    </span>
</body>

</html>